<script type="text/javascript">
  var point1;
  var point2;
  var move;
  var showPoint;
  move=function(point,change){
    return {
        x:point.x+change.x,
        y:point.y+change.y                
          };
   };
  showPoint=function(point){
    console.log("("  + point.x+","+point.y + ")");
  };
  point1={x:2,y:5};
  point2=move(point1,{x:4,y:-2});
  showPoint(point1);
  showPoint(point2);
</script>